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A psychologist wishes to compare mean reaction time on a frequently used reaction task with that on a new task. He assumes that the standard deviation will be 15 msec on both tasks and wants to estimate at the 95% level of confidence the difference between the two population means. The psychologist wants this difference to be within 5 msec of the difference between the sample means. If the psychologist selects two random samples, what should be the size of each?

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